Hello sir
I am Gaurav Verma from India,
I am a CAD jewelry designer working on Rhino 5.0 and Rhinogold 5.0.
I am having +6 of experience in diamond jewelry manufacturing, so I can properly understand the design's geometry, and currently I am doing the same job as you posted for the local jewelry manufacturers.
I can give you .3dm file, stl files and the rendered Images of your designs.